No Internet routable IPV6-PD (Prefix Delegation) from my 5G Home Internet Cobra router

[BigDog934]

I've got my own router (running OpenWrt) connected to the Cobra Router provided by Rogers. The Cobra Router doesn't seem to give out an Internet routable PD (Prefix Delegation). The PD I see on my router is "fdf1:939x:xxxx:4::/62", which is not Internet routable. I'm not sure if that comes from the Cobra or is generated by my router.

Should I expect to get an Internet routable PD from the Cobra or is this a limitation of the Rogers 5G Home Internet service?

*Added Labels*

[RogersTony]

Hello,  @BigDog934 

Welcome to the Rogers Community Forums!

You've reached the right place to post your inquiry. I have tagged some of our resident experts to assist on this matter.

@Datalink 
@-G- 

RogersTony

[-G-]

---

@BigDog934 wrote:

I've got my own router (running OpenWrt) connected to the Cobra Router provided by Rogers. The Cobra Router doesn't seem to give out an Internet routable PD (Prefix Delegation). The PD I see on my router is "fdf1:939x:xxxx:4::/62", which is not Internet routable. I'm not sure if that comes from the Cobra or is generated by my router.

Should I expect to get an Internet routable PD from the Cobra or is this a limitation of the Rogers 5G Home Internet service?

---

I'm not surprised.  The Rogers 5G Home Internet service is not like a typical broadband Internet service that you would get in a major city.  The service has limitations and Rogers do not support using your own router with the service -- they expect you to connect your devices, via Ethernet or Wi-Fi, directly to their modem.  I believe that you can disable Wi-Fi on their modem and connect your own Wi-Fi AP or Wi-Fi mesh network running in AP mode.  However, if you try connecting your own router, I would only expect the Rogers modem to provide your router with its own IPv6 address but not a PD.  Different routers may deal with this situation in different ways.

If you absolutely MUST get such a configuration to work, you can try configuring IPv6 NAT (NAT66 and IPv6 masquerading) on OpenWrt... but I don't know how well this will work or what side-effects might occur.  I don't subscribe to the 5G Home Internet service, so take anything that I say with a grain of salt.

[BigDog934]

Thank you for your interest and suggestion.

I have two routers connected directly to the Cobra, my main router and a testing router. My main router is already set up with NAT66 and has been working acceptably in this mode for over a month.

I'm trying to get away from NAT, if possible, so I've tried various solutions on my testing router. Currently, it's set up as a relay server for DHCPv6. It relays all the DHCPv6 requests to the Cobra. Surprisingly, this works, but there are issues. My DNS server doesn't know about these addresses and I have read that the Cobra is limited to 32 devices.

The DNS issue can be worked around with a lot of manual intervention or setting up of scripts, but that's a pain, especially when NAT66 just works out of the box, as would adequate Prefix Delegation. As an aside, I tried using "ip6neigh" to automate DNS address updates, but that appears to be more oriented to SLAAC addresses. It worked erratically with relayed addresses.

The 32 device limitation of the Cobra is pretty much a deal breaker for using it exclusively as my main router. With all the Smart devices around these days, that limit is easily reached. To be fair that is the limit I have read about. I haven't played around with the Cobra as a main router to know if that's the actual limit. Please correct me if I'm wrong.

I'm in a rural area, so the Rogers 5G Home Internet service is a god send. I just had to take the router out of the box, put in the SIM, power it on and, lo and behold, 100Mbit Internet! That's a vast improvement over my previous 20Mbit, so I shouldn't really complain about inadequate PD, but here I am.